code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/python/ray/rllib/policy/tests/test_policy_checkpoint_restore.py
imports: import os
  import tempfile
  import unittest
  import gymnasium
  import ray
  from ray.rllib.algorithms.appo.appo import APPOConfig
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.policy import Policy
  from ray.rllib.utils.test_utils import framework_iterator
label_desc: Use image node_id 2 for calling the TestPolicyFromCheckpoint obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types